CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net loss	$ (36,375)	$ (86,450)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		171
Non-cash lease expense	145	233
Non-cash gain on lease termination and remeasurement	(7,364)
Accretion of short-term investment discounts	(1,127)	(1,253)
Stock-based compensation expense	10,942	20,317
Changes in operating assets and liabilities:
Interest receivable	110	51
Prepaid expenses and other current assets and prepaid expenses to related party	3,256	2,856
Other assets	122	(72)
Income tax payable		(1)
Accounts payable, accrued expenses, other liabilities and amount due to related party	(25,408)	4,908
Net cash used in operating activities	(55,699)	(59,240)
Cash flows from investing activities
Purchase of short-term investments		(14,196)
Maturities of short-term investments	70,000	93,814
Net cash provided by (used in) investing activities	70,000	79,618
Cash flows from financing activities
Proceeds from issuance of common stock in public offering, net of underwriting discounts, commissions and offering costs		70,169
Proceeds from issuance of stock under the 2020 Employee Stock Purchase Plan	21	315
Net cash provided by financing activities	21	70,484
Net increase in cash, cash equivalents, and restricted cash	14,322	90,862
Cash, cash equivalents, and restricted cash at beginning of period	90,973	106,944
Cash, cash equivalents, and restricted cash at end of period	105,295	197,806
Non-cash investing and financing activities
Unrealized (loss) gain on available-for-sale securities	(77)	243
Deferred offering costs included in accounts payable and accrued expenses		331
Reduction of right-of-use asset due to modification and remeasurement	1,549
Supplemental disclosure of cash flows
Income taxes paid, net of refunds		350
Cash and cash equivalents	104,741	196,954
Restricted cash	554	852
Total cash, cash equivalents, and restricted cash	$ 105,295	$ 197,806